Hitech -Dell Axim X50/ X50V Equivalent Battery (Extended battery with door) Equivalent extended type battery for Dell Axim X50 and Dell Axim X50V PDA handheld Compatible with Dell battery #: 35h00056-00, 310-5964, 310-5965, HC03U, U6191, U6192, T6476, T6845 Comes with a door Li-ion rechargeable battery Capacity: 2200mAh, Voltage:3.7V